O.K. thought it was a rod knock, but after i replaced the fouled out Delco plug with a Champion Platinum, the truck runs nice! I've put about 20 bhighway miles on it today and it seems fine. It looks wet and black (the plug that is) when I pull it, but like I said, it runs fine for now, no knocking or anything. I'm guessing that somewhere down the road, I'll be right where I was before when it is comletely fouled out(knocking and running rough). I did a complete comperssion test and every thing was normal. I tried an old plug wire that looked fine and ran it for about 5 minutes on that plug, but it was still black and wet. So if the wire is good, the plug is good, and the compression is good, What else could it be? I'm trying to get it ready for a 500 mile trip to Canada this week.. Please help!!! Thanks.